Method of producing graphene and other carbon materials

摘要

The invention provides methods for the combustion synthesis (CS) of graphene by a novel exothermic self-sustained reaction between a refractory ceramic compound and a carbon-containing polymer under an inert gas atmosphere. The synthesis of graphene was confirmed by both transmission electron microscopy and Raman spectroscopy. The graphene produced has very low (<1 wt. %) oxygen content. Fluorocarbon gases released due to decomposition of the carbon-containing polymer in the combustion wave can reduce the ceramic to a gas and mesoporous carbon particles and graphene layers. The method does not require an external energy source because it occurs in a self-sustained synergetic manner after ignition. The methods are flexible in terms of tuning the synthesis conditions for desired products, and the method can be scaled to provide kilogram quantities.

主权项

1. A method for forming free-standing graphene sheets comprising initiating a self-sustaining exothermic combustion synthesis reaction between a refractory ceramic compound and a halogen-containing carbon substrate, wherein combustion proceeds under a substantially oxygen-free inert atmosphere at about 0.25 MPa to about 20 MPa, wherein after ignition the reaction is exothermic and self-propagating, and the reaction results in the formation of reduced carbon materials, wherein the reduced carbon materials comprise free-standing graphene sheets substantially void of impurities.